Wrench



C, ROOME AND W. H. HAAS.

WRENCH.

APPLICATION FILED OCT. 23, I918.

Patented Mm; 30, 1920.

0761252 002726 472w WW4.

burrito srnrns PATENT CLEM ROOME AND 'WILLIAM H. HAAS, OF RAUB, INDIANA.

WRENCH.

App1ioation filed October 23, 1918.

To all whom it may concern:

Be it known that we, CLEM Rooms and VVILLIAM H. HAAs, citizens of the United States of America, residing at Raub, in the county of Benton and State of Indiana, have invented new and useful Improvements in renches, of which the following is a specification.

Pertaining to wrenches, the invention seeks to provide, as its principal object, a wrench comprising astationary and a movable j aw, the former being pivotally mounted on the latter and held yieldingly in operative position by means of a plate spring attached on the latter and bearing upon the said former or movable jaw. The purpose of this construction is to permit the wrench, when being used to screw up or unscrew a nut or bolt,-to have its movable jaw yield when shifting the wrench to obtain a new grip on the bolt, so that the shifting may be performed without actually disengaging the tool from the nut or bolt head. Attendant upon this improved construction, there is an adjustable device carried by the stationary jaw, whereby the two may be adjusted to suitvarious sizes of nuts and bolt heads.

A further object of the invention aims at simplicity in construction, effectiveness in operation and cheapness of manufacture.

Still further and other objects, secondary to the aforesaid, appear in the following de scription wherein the tool is set forth in de tail.

As shown and described, a specific embodiment of the invention is adhered to, but to this it not-to be restricted. Actual practical application may suggest certain desirable changes or alterations and the right is claimed to make any which do not depart from the spirit of the. annexed claim.

in the accompanying drawings:

Figure 1 is a view in side elevation of the improved wrench;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 3 is a sectional view taken centrally through the thickness of the improved tool; and

Fig, t is asection on the line 4 4L of 'Fig. 1.

Essentially the invention comprises what might be termed a stationary member A with which there is formed the stationary jaw, a movable member B with which there Specification of Letters Patent.

Patented Mar. 30, 1920.

Serial No. 259,358.

is formed the movable jaw, and an adjustable or supplemental jaw O. The stationary member A is of a substantially L shaped conformation, the longer leg 1 of which forms a handle for the improved tool and the shorter leg the stationary jaw 2. This memher A is made preferably of stock rectangular in crosssection and is shaped preferably by drop-forging. It is formed with a slot 3 at the outer corner of the junction between the jaw 52 and the handle 1 and in this slot there is received the tongue l of the movable member B, this tongue being formed at the end of the leg 5 on said movable member whose other leg 6 constitutes the movable jaw. The movable member B is also of L shaped conformation as shown, and

is also made preferably of stock rectangularl-y in cross-section, and is also shaped preferably by drop-forging.

The movable member B is connected to the movable member A by means of the pin 7 which is inserted transversely through the said member A and held firmly therein.

This pin 7 crosses the slot 3 and-in so doing passes through the tongue 4 with which it is pivotally engaged, and the slot 3 is of suflicient length to permit the tongue and the member which it holds to move freely so that the jaw 6 may be moved toward or away from the jaw 2, the movement toward the latter, however, being limited to a position where the inner face of the jaw 6 will lie .ina plane parallel to the plane of the inner face of the jaw 2. A spring 8 is secured at the back edge of the handle 1 and this spring is preferably of the leaf kind,

being formed at its free end with the U shaped member 9 which straddles the leg of the movable member B, so that the spring 8 is assured of engagement with the said movable member and may tend to force the two jaws toward each other as recited above.

The stationary aw 2; is slotted transversely at two different points, one adjacent the handle 1 and the other adjacent the free end of the said jaw. In these two slots there are slidably mounted the legs of the supplemental j aw C in the form of bar members 10 which are provided with teeth 11 at their facing edges. These teeth 11 have the angular inclination of a screw plate so that they may be engaged by the worm 12 which is set in a slot 13 in the stationary jaw 2. This Worm 12 is formed with a hub 14 whose ends abut the top and bottom walls of the slot and serve to space the worm away from the said top and bottom walls and to prevent any other than angular movement of the worm, since this angular movement is necessary for the worm to perform its function, that of moving the bar members 10 longitudinally in their slots. To permit the worm 12 being turned, there is provided a staff 15 which is journaled in the stationary jaw below the slot and this staff is fixedly connected with the worm and carries on its lower or free end a head 16 knurled or milled at its periphery to permit its being easily turned by hand. The two bar members 10 are united with the transverse member 17 of the supplemental jaw and this transverse member is formed with the wedge shaped end 18, the transverse member acting, further than providing the adjustable feature of the tool, as a means for limiting the facing edges of the two jaws 6 and 2 to parallelpositions with respect to each other.

The leg 5 of the movable member B is formed at its inner edge with a plurality of wedge shaped teeth 18, between any two of which the wedge shaped end may engage and when thus engaged the two jaws are in the parallel posit-ions referred to.

In the use of the improved tool, the sup plemental jaw C may be adjusted by the turning of the handle 16 to definitely position it with respect to the jaw 6 for engagement with a certain size nut or bolt head, the movable member B being held back against the pressure of the spring 8 to permit such adjustment. The proper adj ustment having been obtained, the movable member B is allowed to resume its normal position, when the end 18 will engage between a certain two of the teeth 18. The tool parts are then in their proper position for use with the nut or the head of the bolt concerned. To insure a tightening opera: tion being performed on the nut the tool is engaged with the latter in the usual way,

'that is as the ordinary wrench would be used for the tightening of the nut. The force exerted for tightening of course tends to bring the jaw 6 toward the supplemental jaw C with the result that the nut is firmly grasped. When the wrench has been moved through a certain angular distance, that is when the handle 1 has been moved through a certain angular distance, a reverse movement may be imparted to the handle, but this reverse movement will tend to support the jaw 6 and the supplemental jaw, the latter will rock backward on its pivot pin 7 against the pressure of the spring 8, and finally the two jaws will become widely enough separated to permit them to be entirely disengaged from the two sides of the nut with which they previously enga ed and to engage the next succeeding two si es, when the original forward movement may be imparted to the handle to screw the nut through another prescribed angular distance.

From the foregoing description and the accompanying drawings, it is believed that a clear enough understanding of the invention will be had to render further description unnecessary.

The invention having been described, what is claimed as new and useful is:

A device of the class described comprising a stationary element constituting a handle and a stationary jaw, a movable element constituting the movable jaw, the movable element being pivotally connected to the stationary element and being of L shaped conformation, a plurality of wedge shaped teeth formed at one edge of one leg of the movable element, a supplemental jaw adj ustably mounted on the stationary jaw and between it and the movable jaw, the supplemental jaw being formed with a wedge shaped end for engagement between any two of the aforesaid teeth, and a resilient member mounted on the handle of the stationary element and bearing upon one leg of the movable element, for the useful purpose specified.

In testimony whereof we afiix our signatnres.

CLEM ROOME. WILLIAM H. HAAS. 

